body {
    background-image: url("mask.jpg");;
    background-size: 100%;//背景拉伸占据整个屏幕
    background-repeat: no-repeat;
}

#login_menu {
    width:200px;
    height: 100%;
    padding: 20px;

    position: absolute;
    left: 20%;
    top: 40%;
    margin-left: -240px;
    margin-top: -200px;

    background-color: rgba(242, 237, 187, 0.5);

    border-radius: 30px;

}
#login_frame {//居中
    width: 400px;
    height: 50px;
    padding: 13px;

    position: absolute;
    left: 50%;
    top: 40%;
    margin-left: -240px;
    margin-top: -200px;

    background-color: rgba(255, 248, 237, 0.5);

    border-radius: 10px;
    text-align:center;
}


#image_logo {
    margin-top: 22px;
}

.label_input {
    font-size: 35px;
    font-family: 宋体;

    width: 60px;
    height: 30px;
    line-height: 60px;
    text-align: center;

    color: #f7d38a;
    background-color: #f5ffa7;
    border-top-left-radius: 5px;
    border-bottom-left-radius: 5px;
}

.text_field {
    width: 278px;
    height: 28px;
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
    border: 0;
}

#btn_login {
    font-size: 14px;
    font-family: 宋体;

    width: 120px;
    height: 28px;
    line-height: 28px;
    text-align: center;

    color: white;
    background-color: #196df7;
    border-radius: 6px;
    border: 0;

    float:right;
}

